Calories Burned Running Calculator
Estimate calories burned running from your weight and your speed, pace or distance, plus duration, incline and treadmill or outdoor running — with net and gross calories, kcal per km and mile, and tables by speed and time.
How it works
VO₂ (ml/kg/min) = 0.2·S + 0.9·S·grade + 3.5, S in m/min · Calories/min = VO₂ × weight(kg) ÷ 200 · Net = (VO₂ − 3.5) × weight ÷ 200 · outdoors: grade + 1%
The ACSM running equation estimates oxygen cost from your speed and the incline, then converts oxygen to energy — burning one litre of oxygen releases about five kilocalories. Enter the run as a speed, a pace per kilometre or mile, or a distance and time, and choose kilograms or pounds; the calculator converts everything to the metric units the equation uses. Because the model is per kilogram of body weight, a heavier runner burns proportionally more at the same pace, and grade raises the cost sharply through the 0.9 incline term. Running outdoors adds air resistance, which research puts at about the same cost as a 1% treadmill incline. You get gross calories (everything burned during the run) and net calories (the extra over resting), per minute, per hour, per kilometre and per mile, plus tables for other durations and speeds. The equation is validated for real running speeds, roughly above 8 km/h (5 mph); a very slow jog blurs into walking.
Worked example
A 70 kg (154 lb) runner at 10 km/h (166.7 m/min, a 6:00 /km or 9:39 /mile pace) on a flat treadmill: VO₂ = 0.2 × 166.7 + 3.5 = 36.8 ml/kg/min, so kcal/min = 36.8 × 70 ÷ 200 = 12.9, and 30 minutes burns about 387 kcal (net 350 kcal) over 5 km — about 77 kcal per km. Outdoors the extra 1% grade adds 0.9 × 166.7 × 0.01 = 1.5 ml/kg/min, for about 403 kcal.
Sources: ACSM metabolic equations · Jones AM, Doust JH (1996) — A 1% treadmill grade most accurately reflects the energetic cost of outdoor running
Frequently asked questions
How many calories does running 5 km burn?
Roughly 1 kcal per kilogram of body weight per kilometre on the flat, so about 350 kcal for a 70 kg runner and 450 kcal for a 90 kg runner. Pace changes it less than people expect: running faster burns more per minute but you finish sooner.
Does running burn more than walking the same distance?
Somewhat, mostly because you cover it faster and at higher intensity. Over an identical distance the gap is smaller than people expect — but running lets you burn more per minute.
Are these gross or net calories?
Both are shown. Gross includes the energy you would have used at rest; net subtracts that (1 MET) and is the right number for weight-loss planning. Fitness watches usually show gross or “total” calories.
Why does weight change the number so much?
Energy cost scales with the mass you move, so at the same pace a 90 kg runner burns roughly 30% more than a 70 kg runner. That is built into the per-kilogram equation.
Is treadmill running easier than running outside?
Slightly, because there is no air resistance. Setting the treadmill to a 1% incline roughly matches outdoor effort, which is what the Outdoors option adds.
Related calculators
Estimates are educational and vary with fitness, terrain and running economy; they are not a substitute for measured metabolic testing.